參數(shù)資料
型號(hào): NCP1239
廠商: ON SEMICONDUCTOR
英文描述: Low−Standby High Performance PWM Controller
文件頁(yè)數(shù): 18/38頁(yè)
文件大?。?/td> 1145K
代理商: NCP1239
NCP1239
http://onsemi.com
18
Figure 37 depicts the V
CC
evolution during a proper startup sequence, showing the state of the error flag:
*This time is programmed by the Pin 6 capacitor. C
pin6
= 390 nF nearly sets the following intervals:
SoftStart Time (T
ss
):7.5 ms
Jittering Period (T
jittering
): 10 ms
Fault Detection Delay (T
delay
): 100 ms
More generally, the times approximately depend on C
pin6
as follows:
T
ss
= 7.5 ms * C
pin6
/ 390 nF
T
jittering
=10 ms * C
pin6
/ 390 nF
T
delay
=100 ms * C
pin6
/ 390 nF
Figure 37.
7.5ms*
SS
Ip max
FB
Error
Flag
Timer
Full power
Skip level
VccON
VccOFF
Vcc
Latchoff phase level
Logic reset level
regulation
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been confirmed
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